In the first percentile example isn't the 20th percentile nearer 33 rather than 28? The range between 24 and 59 is 35. Consequently the bin is 0.35 wide. Twenty bins give 7. 24+7=31. Am I correct?

Measuring Position: Quartiles, Percentiles, Standardized Scores

To find the quartiles, sort the data from lowest to highest.

The methods to find the percentiles are actually approximate percentiles.

Standardized scores, also known as z-scores, are used to compare observations from two or more distributions.

Measuring Position: Quartiles, Percentiles, Standardized Scores

Lecture Slides are screen-captured images of important points in the lecture. Students can download and print out these lecture slide images to do practice problems as well as take notes while watching the lecture.

Related Books

The book includes five full length practice exams in addition to a full 15 chapters of review that is divided into the four major themes on the statistics test: Exploratory Analysis, Planning a Study, Probability, and Statistical Interference.

The book includes 2 full length practice tests with detailed answers and explanations, a full review of the subject material presented, and step-by-step techniques for cracking each type of statistical analysis question.